Added property info for Object's and Ref's and ported the implementation of the check method

[DmitriySalnikov]

Supersedes #810
Rebased and fixed. Also added PropertyInfo for Ref<T>
#948 is required for a successful build

Constructor.
Notification: 18
Notification: 31
Notification: 32
Notification: 45
Notification: 10
Notification: 27
Notification: 13
Signal bind

To string
  Example -->  Example:[ GDExtension::Example <--> Instance ID:26541556118 ]
  ExampleMin -->  ExampleMin:[Wrapped:0]
Static method calls
  static (109) 109
  void static
Property list
  property value  (100, 200, 300)
Instance method calls
  Simple func called.
  Simple const func called.
  typed_ptr_parameter called: Example:[ GDExtension::Example <--> Instance ID:26541556118 ] <----------------------
  typed_const_ptr_parameter called: Example:[ GDExtension::Example <--> Instance ID:26541556118 ] <----------------
  Return something called.
...

[DmitriySalnikov]

Rebased to master. Now it should build without problems.

[DmitriySalnikov]

Do I need to do something else to continue the review?

[WildRackoon]

This is spot on, but I am unsure how we can further reduce code duplication within some of those bindings files that are not generated.

[DmitriySalnikov]

Macros can be used here. All 3 VariantCasters can be replaced with such a macro:

#define VARIANT_OBJECT_CAST(impl)                                      \
	template <class T>                                                 \
	struct VariantCaster impl {                                        \
		static _FORCE_INLINE_ T cast(const Variant &p_variant) {       \
			using TStripped = std::remove_pointer_t<T>;                \
			if constexpr (std::is_base_of<Object, TStripped>::value) { \
				return Object::cast_to<TStripped>(p_variant);          \
			} else {                                                   \
				return p_variant;                                      \
			}                                                          \
		}                                                              \
	}

// Will produce a warning. Error when building for Windows with godot-cpp's CI.
VARIANT_OBJECT_CAST();
VARIANT_OBJECT_CAST(<T &>);
VARIANT_OBJECT_CAST(<const T &>);

But there will still be a bunch of duplicated code nearby. I'll leave my changes here as is.
It may be worth creating a separate PR to remove all duplicates.

[DmitriySalnikov]

After the rebase, I removed the examples here, but I think this is not a problem because one of them has already been merged in another PR

[Faless]

See the changes to use appropriate hint string (as in upstream godot).
The class_name is then copied automatically from the hint_string in make_property_info.

[DmitriySalnikov]

Done.

[DmitriySalnikov]

Do I need to do something else?

[WildRackoon]

I would also really like to see those kind of convenience fixes land in godot-cpp soon

Changes done.

[akien-mga]

Thanks!